The carburizer for iron casting can significantly enhance the distribution quantity and quality of graphite in the casting and produce high-quality metallographic structure. It is suitable for the adjustment process of carbon equivalent in the smelting process of gray cast iron and nodular cast iron.
The carburizer can be classified as either amorphous or crystalline depending on the carbon's crystal structure, and depending on whether or not carbon atoms are present, it can be either a graphitized carbon raiser or a non-graphitized carbon raiser. Broken graphite electrodes and graphitized petroleum coke are the two main components of graphitized carburizers.
Carburizers for petroleum coke that have been graphitized are commonly utilized in the foundry sector. In order to convert the petroleum coke's amorphous carbon into three-dimensional ordered graphite crystals, the raw petroleum coke must be heated to a high temperature of 3000 °C in a graphitization furnace. The process of disposal, or getting to the graphitized state after going through the graphitization process. Fixated carbon content, sulfur content, volatile content, ash content, nitrogen content, and moisture are the primary determinants of recarburizer quality. The sulfur and nitrogen content of the graphitized recarburizer is significantly lower than that of the non-graphitized recarburizer following high-temperature graphitization processing.
Cast iron carburizers can absorb more than 90% of the molten iron; this method uses layered additions of scrap steel and carburizers; the molten iron absorbs 60% to 80% of the fuel; and this method uses the first addition of cast iron to fuel. The absorption rate of the molten iron to the fuel in the method of melting scrap steel by heating the agent ranges from 80% to 90%. It is clear that early addition of the fuel, prolonged heating, and an adequate high temperature section are necessary to improve the rate at which the fuel is absorbed during the production of synthetic cast iron.
In actuality, adding a carburant is a crucial step to increase the graphite nucleation core in the casting, achieve a better matrix structure, and enhance the macro-mechanical properties rather than merely increasing the carbon content. But not all recarburizers may produce the effects mentioned above. Qualified recarburizer production requires careful material selection, followed by high-temperature graphitization. Along with reducing impurities like sulfur, nitrogen, ash, volatile matter, and moisture, the process also improves the purity of the materials and changes the way that the carbon atoms are arranged. Improve its integration into the cast iron structure while preventing the formation of nitrogen holes.